Why would any of this change developers' profit motive?
> the housing being built isn't going to serve the those who are housing insecure
We agree. This is because housing supply is constrained. That raises its price, which makes it unaffordable for more people. Removing supply constraints changes that.
Also, new luxury housing absolutely lowers housing prices. I've seen it personally. A luxury building opened nearby. I figured there was a 10 to 15% difference after accounting for amenities like its gym, in exchange for more space and a quieter apartment. Others clearly did the math, because we lost two people in the building to it. I showed my math to the landlord, told them I was considering decamping, and negotiated down my rent. I told my neighbours and they each did the same. We had more choices, and so had to pay less. Basic supply and demand.